Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!think.com!mintaka!ogicse!milton!serval!yoda.eecs.wsu.edu!mwoodwar
From: mwoodwar@yoda.eecs.wsu.edu (woodward matthew d    - CS350)
Newsgroups: comp.sys.atari.8bit
Subject: Re: 64k mod for 600XL
Message-ID: <1991Apr22.173553.9978@serval.net.wsu.edu>
Date: 22 Apr 91 17:35:53 GMT
Article-I.D.: serval.1991Apr22.173553.9978
References: <71574@eerie.acsu.Buffalo.EDU> <48510005@hpcupt3.cup.hp.com> <72272@eerie.acsu.Buffalo.EDU>
Sender: news@serval.net.wsu.edu (USENET News System)
Distribution: usa
Organization: Washington State University
Lines: 19

In article <72272@eerie.acsu.Buffalo.EDU> v104nmym@ubvmsd.cc.buffalo.edu writes:
>In article <48510005@hpcupt3.cup.hp.com>, ken@hpcupt3.cup.hp.com (Kenneth M. Sumrall) writes...
>>I designed my own 64K mod for the 600XL back in 1987.  It requires
>>two 64Kx4 ram chips, and three jumper wires.  Here it is.
>> 
>> 
>[instructions for mod deleted]
>Thanks for the tips, but I've got one problem...how do i know which pin is which?  That's the reason why I put off on doing it years ago, and then
>I just let it sit for so long that I lost it.
>So could you mail me, or post to the net on how to figure out what
>pins are what?  Thanks,

Look at the IC so the notch on a narrow end is at the top.  The pins are then
numbered counter-clockwise from the notch.  (Go down the left side, then
up the right)

Matt

>Sherm